Place it at the start of a phone scene, just before the home screen appears, then follow it with a bell ding to mark a success or a camera shutter when a photo is taken. That order keeps the phone sequence clear and easy to follow.
关于此声音
This is the short unlock sound from iOS 5, a brief two-second system sound that plays when an iPhone is unlocked. It feels clean, familiar and quietly satisfying, like a small piece of everyday phone history coming back for a second.